@misc{Kostûško_I.I._Polʹskoe,
 author={Kostûško, I.I.},
 howpublished={online},
 publisher={Institut slavânovedeniâ Rossijskoj Akademii Nauk},
 language={rosyjski},
 title={Polʹskoe nacionalʹnoe menʹšinstvo v SSSR (1920-e gody)},
}